Stoker grate



T. J. COURTNEY sept. .21 1926.

STOKER GRATE Filed March v 1924 Patented Sept. 2 1, 1926..

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STOKER GRATE.

Application led March '7, V1924. Serial No. 697,621. y

grate section through which the air passesp and providingimprov'ed meansfor securing the grate sections to the Vgrate bars.

The various features of the invention will appear from the detaileddescription taken in connection with the accompanying sheet of drawingsforming part of this specification, Fig. 1 in the drawings being abottom perspective view of the grate section, one of the securingelements shown in position ready to be inserted on the holding means onthe grate section;rand Fig.2 is a longit-u-l dinal section taken througha pair of adj-acent grate sections and showing one of said sectionssecured on the grate bar.

In the drawings, the grate bar to which the respective grate sectionsare secured isindicated at 1it being understood that the grate bars aresecured to chains whichcarry the grate section from one end of the stolrer to the other. The grate bar has a shelf 2 having a hole thereinfor the reception of a bolt 3 which has a fiat head 4 adapted to seatY adepression in the bottom of a plate 5 which has upwardly and inwardlydirected claws 6 for holding'a T-head 7 which is secured in any suitablemanner as by means of rivets 8 to the body of the grate section." Byvproviding'a fiat head 4 on the bolt and providing a flat seat'intheplate 5, the plate will be held` to the grate section without dangerV ofbreakage of the plate as oftenoccurs when a tapered head iskv used' onthe bolt. The use of a fiat head 4 on the bolt also over;

' comes the liability of the head extending above the top vsurface ofthe4 plate as fre- "quently occurs when a tapered bolt head is used. Y

The grate sectiony is provided with a plu-l rality of holes for thepassage of air upn 'wardly and said'h'oles fiare outwardly as at.

11 from a point below thesurface ofthe grate and flare outwardly as at12 downwardly from said point. By having the holes flare outwardlytoward the top of the 'grate7 there is 'lesslikelihood of the ,holes`becoming burned and closing'up when the Y n fire is ,allowed to burn tothe grate surface.

Furthermore when air leavesthe mouth of the air. passages through saidflares it hasa spreading effect through ther fuel which means goodcombustion. I consider this an important feature of the inventionbecause Vso far as I am aware grates .h-avehitherto been constructedwith holes of av uniform .diameter for some distance into the body ofthe grate section.

Another important feature of the -invention is the provision of adownwardly and forwardly extending extension 13 having a downwardlyextending iiange 14 whichex# tends transversely of the said extension,said venting the fliow of airbeneath said eXten-v sion. Disposed abovesaideXtension 13 is an adjacent grate section 9 yasclearly shown in Fig.2. The extension 18is provided with a plurality of lugs 15 on which theadjacent end of the grate section 9 rests, said-lugs 4flange resting onthe gra-te bar land pre- A versely `extending flange 14 prevents ai freeflow of air betweenthe adjacent grate sections, the result being thatthe air must come or pass directly from beneath the section. It Vistherefore apparent that 'thereis less tendency for theV air current tosweep directly below the` grate section without passing upwardly throughthe holes. j words,` by arranging a flange 14 between the ends of thegrate section the air will 'rise through' the grate sections fromdirectly" In other A below the same with the resultthatfbetterpcombustion is obtained?. In vgrates asheretofore construct-edl theairgwould pass dif rectly through Vthe forward grate sections of' 4 thestoker Vwith theresult thatvthe grates Y 1. The combination of aplurality ofgrate Y f` one end of each section having a downf sections'arranged in longitudinal alinement,

wardly land forwardly extending extension V adapted to under-hein spacedrelation the end of the adjacent sect-ion, and a flange exltendingkdownwardlyfrom said extension ,2" y Y Y 1,600,868

and transversely thereof for cutting 0E flow end of thegrate sectionneXt in' order, and 0f alr between said sections. a downwardly dlrectedflange vcerf-leid hy 10 2. The combination with grate support-each ofthe sald extenslons and extendlng Y ing means, a pluralityof gratesections an the entire length thereof and eng-aging the ranged inlongitudinal alinement, adowngrate supporting means.

w'ardly and forwardly extending` curved eX- In testimony whereof I affixmy sg'nture.

tension carried b one end of each of the,

grate sections and underlying the adjacent THOMASv J. GOURTNEYV.V

